Why do organisms need water?


Organisms need water for

(i) Cellular processes - as all the processes take place in a water medium.

(ii) Transportation of substances - water is used for the transportation of substances from one part of the body to the other.

(iii) Reactions - All the reactions that occur in the cell or body occur between substances dissolved in water. 

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How are clouds formed?


A large amount of water evaporates from the water bodies and goes into the air. Some amount of water vapour also gets into the air due to various biological activities. The hot air rises up carrying the water vapour with it. As the air rises up, it gets cooled. Cooling causes the water vapour in the air to condense in the form of tiny droplets around dust and other suspended particles in the air. This leads to the formation of clouds.

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Do you know of any activity which may be polluting this water source?


The activity which pollutes the water resource are:

River. The sewage from the town and the cities are dumped into the water bodies and lead to its pollution.

Well. Washing and bathing near the well leads to the pollution of water.  

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What is soil erosion?


Removal of useful components of the soil and addition of the substances that affect the soil quality adversely and kills the diversity of the organisms living in the soil is called as soil erosion. 

 

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List any three human activities that you think would lead to air pollution.


Man made sources of air pollution:

(i) Use of diesel and petrol in vehicles.

(ii) Burning of coal in factories, engines and thermal power stations.

(iii) Deforestation.

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